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Abstract:

Provided is a method of producing a liquid-cooled jacket wherein
deformation of a seal body can be minimized. A method of producing a
liquid-cooled jacket constituted by fixing a seal body which seals the
opening of a recess, by friction stir welding, to a jacket body having a
partially opening recess through which heat transport fluid for
transporting heat generated by a heat generating body to the outside
flows, wherein the seal body is mounted on a supporting surface which is
formed at the peripheral edge of the opening of the recess in the jacket
body and consists of the bottom surface of a step lower than the surface
of the jacket body, the side surface of the step of the jacket body and
the outer circumferential surface of the seal body are butted each other,
a plasticized region is formed by making one round of a rotary tool which
is equipped with a stir pin having a length greater than the thickness of
the seal body round along the butting portion of the side surface of the
step of the jacket body and the outer circumferential surface of the seal
body, and then the seal body is welded to the jacket body.

Claims:

1. A manufacturing method of liquid-cooled jacket configured to fix a
seal body sealing an opening of a recess in a jacket body circulating a
heat transport fluid for transmitting heat generated in a heat generating
body to an outside area and having a recess, a supporting surface formed
in an opening circumferential edge of the recess of the jacket body and
composed of a step bottom surface with the jacket body being lower than a
surface of the jacket body, comprising steps of: attaching a cooling
plate having a flowing cooling medium on a surface opposite to a surface
performing a friction stir welding in the jacket body; putting the seal
body on a supporting surface and confronting a step side surface of the
jacket body with an outer circumferential surface of the seal body; and
moving a rotary tool with a stir pin being larger than a thickness of the
seal body along a butting portion between the step side surface of the
jacket body and the outer circumferential surface of the seal body to
form a plasticized region and friction stir welding together the seal
body to the jacket body, while cooling down the jacket body.

2. The manufacturing method of liquid-cooled jacket according to claim 1,
wherein a width of the supporting surface is larger than a radius of a
shoulder of the rotary tool.

3. The manufacturing method of liquid-cooled jacket according to claim 1,
wherein a cooling channel flowing the cooling medium of the cooling plate
is, at least, provided with a plane form formed along a moving locus of
the rotary tool.

4. The manufacturing method of liquid-cooled jacket according to claim 1,
wherein the cooling channel flowing the cooling medium through the
cooling plate is configured by a cooling tube embedded in the cooling
plate.

5. The manufacturing method of liquid-cooled jacket according to claim 1,
wherein the method further comprises: flowing the cooling medium inside
the recess as the opening is sealed by the seal body; and performing the
friction stir welding by moving the rotary tool, while cooling down the
jacket body and the seal body.

6. The manufacturing method of liquid-cooled jacket according to claim 1,
wherein the method further comprises: moving the rotary tool in a
clockwise direction around the opening while turning the rotary tool in a
clockwise direction; and moving the rotary tool in a counterclockwise
direction around the opening while turning the rotary tool in a
counterclockwise direction.

7. The manufacturing method of liquid-cooled jacket according to claim 6,
wherein the method further comprises: shifting the rotary tool to an
outer circumference of the plasticized region formed after having made
one round with the rotary tool along the butting portion; and moving the
rotary tool along the butting portion a second time to restir in the
outer circumference of the plasticized region.

8. The manufacturing method of liquid-cooled jacket according to claim 1,
wherein the method further comprises: joining together temporarily a part
of the butting portion with use of the rotary tool for temporary joint,
which is smaller than the rotary tool, prior to forming the plasticized
region by the rotary tool.

9. The manufacturing method of liquid-cooled jacket according to claim 8,
wherein the butting portion is formed like a rectangular frame, and
temporarily joining together the butting portion with use of the rotary
tool for temporary joint, after one set of diagonal elements of the
butting portion has been temporarily joined together, other diagonal set
of elements of the butting portion is temporarily joined together.

10. The manufacturing method of liquid-cooled jacket according to claim
8, wherein the butting portion is formed like a rectangular frame, and
temporarily joining together the butting portion with use of the rotary
tool for temporary joint, after intermediate portions in opposite sides
of the butting portions have been temporarily joined together,
intermediate portions in other opposite sides of the butting portions are
temporarily joined together.

Description:

CROSS-REFERENCE TO RELATED APPLICATIONS

[0001] This is a continuation application of U.S. patent application Ser.
No. 13/148,955, filed on Aug. 11, 2011, which is a 371 application of
International Patent Application No. PCT/JP2009/070963 filed Dec. 16,
2009, which claims foreign priority benefit of Japanese Patent
Application No. 2009-038808, filed on Feb. 23, 2009. The subject matter
of the prior applications is hereby incorporated by reference.

TECHNICAL FIELD

[0002] This invention relates to a manufacturing method of liquid-cooled
jacket, which is configured to fix a seal body in an opening of a recess
of jacket body by friction stir welding.

BACKGROUND ART

[0003] The friction stir welding (FSW: Friction Stir Welding) has been
known as a method for joining together metallic components. The friction
stir welding is designed to rotate and move a rotary tool along a butting
portion of metallic components, force the metal at the butting portion to
make in plastic flow resulted from the friction heat between the rotary
tool and the metallic component, and join together in solid phase between
the metallic components.

[0004] In recent years, as electronic devices, for example, personal
computers have been developed in performance, calorific value of CPU
(heat generating body) boarded therein has been increasing in amount.
Then, it has been becoming important to cool down the CPU.
Conventionally, although a heat sink typed of air cooling fan has been
used to cool down the CPU, problems such as noises caused by fan and
cooling limits by air cooling have been gathering attention. Thus, the
liquid-cooled jacket has been gathering attention as a next-generation
cooling system.

[0005] In such a liquid-cooled jacket, an art for joining together between
constituent components by the friction stir welding has been disclosed in
Japanese Patent Unexamined Laid-open publication No. 324,647 of 2006. The
liquid-cooled jacket is, for example, provided with a jacket body having
a fin housing for metallic fins and a seal body for the fin housing.
Then, it is configured to manufacture the liquid-cooled jacket by the
friction stir welding by going round the rotary tool along a butting
portion between a peripheral wall of the jacket body surrounding the fin
housing and a circumferential surface of the seal body. The seal body is
formed to be thinner compared with the jacket body and put on a
supporting surface comprising of a bottom surface of a step portion
formed in the jacket body. The rotary tool is moved along the butting
portion in order to place its center on the butting portion. Then, the
jacket body and the seal body are mutually joined together.

[0006] As above mentioned, in case where the thin-walled seal body is put
on a supporting surface of the jacket body to join together the butting
portion by the friction stir welding, it has a problem that the seal body
is curved and warped by thermal contraction and expansion owing to the
friction stir occurred on a surface of the jacket body.

[0007] In order to solve the above problems, an art for emitting a water
jet by a cooling nozzle at a place of the friction stir welding and
pressing the butting portion by a roller after the friction stir welding
has been disclosed in Japanese Patent Unexamined Laid-open Publication
No. 87,871 of 2001.

SUMMARY OF THE INVENTION

Problem to be Solved by the Invention

[0008] In an invention relating to this publication (Japanese Patent
Unexamined Laid-open Publication No. 87,871 of 2001), it might steep
water in the friction stir welding device and have a bad influence on
drive system or the like, because water is emitted in the place at the
friction stir welding. It has a problem that water is scattered in the
surrounding by a rotation of the rotary tool and the water management
becomes troublesome owing to water jet at the joint place.

[0009] In such a viewpoint, the present invention is an object to provide
a manufacturing method of liquid-cooled jacket, by which a deformation of
the seal body can be easily reduced.

Means Solving the Problem

[0010] As a means for solving the above problem, this invention is
constituted that a manufacturing method of liquid-cooled jacket
configured to fix a seal body for sealing an opening of a recess in a
jacket body making heat transport fluid transporting heat generated by
heat generating body to flow to the outside and having a recess in
accordance with the friction stir welding. Furthermore, this invention
comprises a step putting the seal body on a supporting surface formed in
a peripheral portion of opening of the recess of the jacket body and
composing of a step portion bottom surface placed to be lower from a
surface of the jacket body and a step of confronting the seal body with a
step portion side surface of the jacket body. Still more, this invention
comprises a step forming a plasticized region by going round the rotary
tool having a stir pin with its size having a larger length than a
thickness of the seal body along the butting portion between the step
portion side surface of the jacket body and the circumferential surface
of the seal body, and joining together the seal body in the jacket body.

[0011] In this method, as a stir pin of the rotary tool is inserted from
the supporting surface in the jacket body, the plasticized region is
formed in a deep portion of the jacket body. Then, the stress caused by
thermal contraction of the plasticized region can be dissipated in the
jacket body to prevent a deformation of the seal body.

[0012] The present invention is characterized in that a width of the
supporting surface is larger than a radius of a shoulder of the rotary
tool.

[0013] In such a method, when the rotary tool moves at a top of the
butting portion, the plasticized region can be formed in the supporting
surface to securely support an indentation force of the rotary tool at
the supporting surface.

[0014] The present invention is characterized in that the recess is
provided with a ridge having a same surface as the supporting surface
therein and the method comprises forming a plasticized region by moving
the rotary tool along the ridge on a surface of the seal body and joining
together the seal body to the ridge.

[0015] In such a method, as the jacket body and the seal body are mutually
joined together at the ridge having a same surface as the supporting
surface inside the recess, even if the recess is large in area, a
deformation of the seal body can be effectively prevented.

[0016] The present invention is characterized in that a width of the ridge
is larger than a diameter of the shoulder of the rotary tool.

[0017] In this method, as the plasticized region is formed in the ridge,
when the rotary tool moves at a top of the ridge, the indentation force
can be securely supported on the ridge.

[0018] The present invention is characterized in that the method comprises
a step attaching a cooling plate circulating a cooling medium to an
opposite surface to a surface performing the friction stir welding of the
jacket body, and a step moving the rotary tool, while cooling down the
jacket body.

[0019] In this method, as heat generated by the friction stir welding is
absorbed by the cooling plate, thermal contraction in the plasticized
region can be reduced and a deformation of the seal body can be
effectively prevented.

[0020] The present invention is characterized in that a cooling channel
circulating the cooling medium of the cooling plate is, at least,
provided with a plane shape forming along a moving locus of the rotary
tool.

[0021] In this method, as heat generated by the friction stir welding can
be effectively absorbed in the proximity of the generated place, a
deformation of the seal body can be effectively prevented.

[0022] The present invention is characterized in that the cooling channel
circulating the cooling medium of the cooling plate is configured by a
cooling tube embedded in the cooling plate.

[0023] In this method, it is easy to provide a cooling channel, in which
the cooling medium is easy to circulate without leak.

[0024] The present invention is characterized in that it comprises a step
performing the friction stir welding by moving the rotary tool while the
recess, as the opening is sealed by the seal body, is circulated therein
and the jacket body and the seal body is cooled down.

[0025] In this method, as heat generated by friction stir welding can be
absorbed by the cooling medium without a cooling plate, thermal
contraction in the plasticized region can be made small, a deformation of
the seal body can be effectively prevented, and manufacturing step can be
simplified.

[0026] The present invention is characterized in that the method comprises
a step turning the rotary tool in a clockwise direction, when the rotary
tool moves in a clockwise direction around the opening and a step turning
the rotary tool in a counterclockwise direction, when the rotary tool
moves in a counterclockwise direction around the opening.

[0027] In this method, even if there is a cavity defect, it takes place at
a position being outer from the butting portion and spacing far from a
channel of heat transport fluid. Therefore, the heat transport fluid is
hard to leak outside from the channel, and it has no bad influence on a
sealing performance of the butting portion.

[0028] The present invention is characterized in that it comprises a step
restirring an outer side of the plasticized region by shifting the rotary
tool to the outside of the plasticized region formed at the time of
making one round after making one round the rotary tool along the butting
portion, and going one more round the rotary tool along the butting
portion.

[0029] In this method, even if the cavity defect occurs on first round,
the cavity defect can be reduced by stirring and moving on a second
round. Even if the cavity defect occurs on a second round, it occurs at
the portion spaced far from the butting portion between the peripheral
edge of an opening of the jacket body and the peripheral edge of the seal
body. Accordingly, the heat transport fluid is hard to leak outside and
it can greatly improve a sealing performance of the butting portion.

[0030] The present invention is characterized in that it comprises a step
joining together temporarily a part of the butting portion with use of
the rotary tool for temporary joint being smaller in size than the rotary
tool, prior to a step forming the plasticized region with use of the
rotary tool.

[0031] In this method, the seal body never moves, it is easy to joint, and
a positioning accuracy of the seal body improves at the time of friction
stir welding (hereinafter, it may be referred to as "formal joint") by
temporary joint between the jacket body and the seal body. As the rotary
tool for temporary joint is smaller in size than the rotary tool for
formal joint, the formal joint can be completed by moving the rotary tool
for the formal joint on the temporary joint portion and performing the
formal joint.

[0032] The present invention is characterized in that the butting portion
forms like a rectangular frame. In a step for temporarily joining the
butting portion with use of the rotary tool for temporary joint, after
one diagonal elements of the butting portion is temporarily joined
together, the other diagonal elements of the butting portion is
temporarily joined together.

[0033] The present invention is characterized in that the butting portion
forms like a rectangular frame. In a step for temporarily joining
together the butting portion with use of the rotary tool for temporary
joint, after intermediate portions in one opposite sides of the butting
portions are temporarily joined together, intermediate portions in the
other opposite sides of the butting portions are temporarily joined
together.

[0034] In this method, the seal body can be temporarily joined together in
good balance and the positioning accuracy relative to the jacket body of
the seal body greatly improves.

Effect of the Invention

[0035] The present invention has an excellent effect to easily control a
deformation of the seal body.

BRIEF DESCRIPTION OF THE DRAWINGS

[0036] FIG. 1 is an exploded perspective view showing a liquid-cooled
jacket in accordance with a first embodiment of the present invention.

[0037] FIG. 2 is a perspective view showing from oblique lower of the seal
body of the liquid-cooled jacket in accordance with the first embodiment
of the present invention.

[0038] FIG. 3A is a sectional view showing a step for friction stir
welding on a first round, and FIG. 3B is a sectional view showing a step
for friction stir welding on a second round in accordance with the first
embodiment of the present invention.

[0039] FIG. 4 is a view for explaining a manufacturing method of
liquid-cooled jacket in accordance with a first embodiment of the present
invention, and a sectional view showing a step for friction stir welding
at a ridge.

[0040] FIG. 5A is a plan view showing a step for temporary joint, and FIG.
5B is a plan view showing a step for formal joint in accordance with the
first embodiment of the present invention.

[0041] FIGS. 6A and 6B are views for explaining a step for friction stir
of the manufacturing method of liquid-cooled jacket in accordance with
the first embodiment of the present invention, and a plan view showing a
step for friction stir (step for formal joint) following in FIGS. 5A and
5B.

[0042] FIGS. 7A and 7B are views for explaining a step for friction stir
of the manufacturing method of liquid-cooled jacket in accordance with
the first embodiment of the present invention, and a plan view showing a
step for friction stir following in FIGS. 6A and 6B.

[0043] FIG. 8A is a condition in use, and FIG. 8B is a perspective view
showing an exploded perspective view in accordance with a second
embodiment of the present invention.

[0044] FIG. 9A is a plan view showing a step for temporary joint, and FIG.
9B is a plan view showing a step for formal joint in accordance with a
third embodiment of the present invention.

EMBODIMENT FOR CARRYING OUT THE INVENTION

First Embodiment

[0045] In a first embodiment of the present invention, it will be
described in detail with reference to the drawings.

[0046] At first, a liquid-cooled jacket formed by a manufacturing method
of liquid-cooled jacket in accordance with the present invention will be
described. The liquid-cooled jacket is, for example, a constituent
component of a cooling system in an electronic device such as a personal
computer to be parts cooling down CPU (heat generator) or the like. The
liquid cooling system is mainly provided with a liquid-cooled jacket
attached to the CPU at a predetermined position, a radiator (radiating
means) irradiating heat transmitted by a cooling water (heat transport
fluid) to the outside, a micro-pump (heat transport fluid supply means)
circulating the cooling water, a reserve tank absorbing
expansion/contraction of the cooling water based on a change of
temperature, a flexible tube connecting thereto, and the cooling water
for transmitting heat. The cooling water is a heat transport fluid
transmitting heat generated in the CPU as heat generator, as not shown,
to the outside. As the cooling water, an anti-freezing solution of
ethylene glycol is, for example, used. When the micro-pump actuates, the
cooling water is designed to circulate through these devices.

[0047] As shown in FIG. 1, the liquid-cooled jacket 1 is configured to
circulate the cooling water (as not shown) therethrough and to fix the
seal body 30 sealing an opening 12 of a recess 11 to a jacket body 10
having a recess 11 with a part thereof opened with use of a friction stir
welding (See FIG. 5A to FIG. 7B).

[0048] The liquid-cooled jacket 1 is designed to provide CPU (as not
shown) through a thermal diffusion sheet (as not shown) in a middle of
the lower side thereof to receive heat generated by the CPU and heat
exchange the cooling water circulating therethrough. Then, the
liquid-cooled jacket 1 transmits heat received from the CPU to the
cooling water, thus to effectively cool down the CPU. In addition, the
thermal diffusion sheet is a sheet for effectively transmitting heat
generated in the CPU to the jacket body 10. For example, it is made of
metal having high performance in conductivity such as copper.

[0049] The jacket body 10 is a shallow box with one side thereof (an upper
side in FIG. 1 of this embodiment) opened and forms like a rectangle as
seen from top in this embodiment. The jacket body 10 is provided with the
recess 11 with its top opened therein, and includes a bottom wall 13 of
the recess 11 and a peripheral wall 14. Such jacket body 10 is made by,
for example, dye cast, casting, forging, or the like. The jacket body 10
is made of aluminum or aluminum alloy. Thus, a lightweight of the
liquid-cooled jacket 11 can be obtained and then it is easy to handle it.

[0050] An opening 12 of the recess 11 of the jacket body 10 forms like a
substantially rectangle with four corners chamfered in arc-shaped forms.
An opening edge 12a of the recess 11 of the jacket body 10 is provided
with a supporting surface 15a made by a step portion bottom surface
lowered to the bottom side of the recess 11. In this embodiment, although
a ridge 17 is formed inside the recess 11, an opening 12 of the recess 11
is described to show a substantially rectangle to regard the ridge 17 as
a part of the recess 11. The opening peripheral edge 12a of the recess 11
is considered as a peripheral edge of the recess 11 including the ridge
17.

[0051] As shown in FIG. 3A, an elevation difference H1 between an upper
surface of the jacket body 10 and a supporting surface 15a is a same
length as a thickness T1 of the seal body 30. The supporting surface 15a
is a surface for supporting the seal body 30 and a peripheral edge 30a of
the seal body 30 is put on the supporting surface 15a. A width W1 of the
supporting surface 15a (a width of portion for putting a peripheral edge
30a of the seal body 30) is set to be larger than a radius R2 of the
shoulder 51 of a so-called rotary tool 50 used in the friction stir
welding.

[0052] As shown in FIG. 1, the peripheral wall 14 surrounding the recess
11 is constituted by a pair of walls 14a, 14b positioning at both ends in
a longitudinal direction of the jacket body 10 (X-axis direction in FIG.
1), and a pair of walls 14c, 14d positioning at both ends in a lateral
(short-side) direction thereof (Y-axis direction in FIG. 1). The pair of
walls 14a, 14b are configured to extend in Y-axis direction, space a
predetermined distance in X-axis direction, and arrange mutually in
parallel. The pair of walls 14c, 14d are also configured to extend in
X-axis direction, space a predetermined distance in Y-axis direction, and
then arrange mutually in parallel.

[0053] The recess 11 is provided with a ridge 17 therein. The ridge 17 is
constituted by a wall body standing from a bottom wall 13 of the recess
11. A height from the bottom wall 13 of the ridge 17 is a same height as
a height standing from the bottom wall 13 of the supporting surface 15a.
That is, an upper surface 17a of the ridge 17 (a surface of the ridge 17)
is a same surface with the supporting surface 15a formed in an open
circumferential edge 12a. The ridge 17 extends in X-axis direction from a
center of a portion in Y-axis direction of an inner wall surface of one
wall 14a (inner circumferential wall side surface of the recess 11)
toward the other wall 14b between the pair of walls 14a, 14b. A tip in an
extending direction (X-axis direction) of the ridge 17 spaces a
predetermined distance with an inner wall surface (inner circumferential
side surface of the recess 11) of the wall 14b. It is provided with a
space for flowing cooling fluid between a tip of the ridge 17 and an
inner wall surface of the wall 14b. Namely, it is provided with a groove
(substantially hollow portion) in a U-shape letter form as seen from top
to form the ridge 17 inside the recess 11. Then, it is designed to flow
cooling fluid along this U-shape letter. The wall 14a positioned at both
ends of a channel in U-shape letter as seen from top is respectively
provided with through holes 16, 16 for flowing cooling water in the
recess 11. The through holes 16, 16 extend in X-axis direction in this
embodiment, and are formed to have a circular section in a middle portion
of depth direction of the recess 11. Forms, numbers, and positions of the
through hole 16 are not limited to these, and they are appropriately
changeable according to kinds and flow rate of the cooling water.

[0054] As shown in FIGS. 1 and 2, the seal body 30 is provided with a lid
plate portion 31 with an outer form having a same form (substantially
rectangle chamfered in an arc-shaped form at four corners in this
embodiment) as the step side surface 15b (Refer to FIG. 1) of the jacket
body 10, and a plurality of fins 32, 32, . . . provided under a surface
of the lid plate portion 31.

[0055] The fin 32 is provided in order to make large a surface area of the
seal body 30. The plurality of fins 32, 32, . . . are designed to
mutually arrange in parallel and cross the lid plate portion 31. Then,
the fins are integrally constituted with the lid plate portion 31.
Accordingly, it is designed to preferably transmit heat among the lid
plate portion 31 and the fins 32, 32, . . . . As shown in FIG. 1, the
fins 32, 32, . . . are arranged to extend in a direction (X-axis
direction in FIG. 1), in which the through holes 16, 16, . . . cross the
wall 14a of the peripheral wall 14 forming the through holes 16, 16, . .
. . As the ridge 17 is positioned in a center of Y-axis direction of the
lid plate portion 31 at the time of setting to the jacket body 10, the
fins are not provided. The fin 32 has a same deep size (depth) (length in
a Z-axis direction in FIG. 1) as a depth of the recess 11, so that the
tip keeps in contact with a bottom surface of the recess 11 (a surface of
the bottom wall 13). Accordingly, a tubular space is separated by the lid
plate portion 31 of the seal body 30 and the neighboring fins 32, 32 in a
condition that the seal body 30 is attached to the jacket body 10. Then,
this space is functioned as a channel 33 (See FIG. 5A) making a flow of
the cooling water.

[0056] The fins 32, 32 . . . have a shorter in length (length in X-axis
direction in FIG. 1) than an extension of the ridge 17. One ends of the
fins (side of the wall 14a) are respectively configured to separate an
inner wall surface of the wall 14a in a predetermined interval. The space
between one ends of these fins 32, 32, . . . and the wall 14a are
constituted a channel header 34 (See FIG. 5A) connecting a channel 33
separated by the fins 32, 32 and the through hole 16. The other ends of
the fins 32, 32, . . . (side of the wall 14b) are positioned at a portion
equivalent to a tip of the ridge 17. The space among the other ends of
the fins 32, 32, . . . , a tip of the ridge 17, and the wall 14b are
designed to constitute a communication channel 35 (See FIG. 5A)
connecting between the channels 33, 33 positioned at both sides of the
ridge 17.

[0057] The seal body 30 as well as the jacket body 10 is formed by
aluminum or aluminum alloy. Thus, a weight saving of the liquid-cooled
jacket 1 can be obtained to easily handle. The lid plate portion 31 and
the fin 32 of the seal body 30 are manufactured by cutting a block formed
of aluminum or aluminum alloy. The manufacturing method is not limited to
this, and it may be manufactured by, for example, dye casting, casting,
forging, or the like. It may be manufactured by the extrusion molding or
grooving of components with a sectional form composed of the lid plate
portion 31 and a plurality of the fins 32, 32, . . . and by eliminating
both ends of the fin 32.

[0058] Next, a method for fixing the seal body 30 in the jacket body 10 by
the friction stir welding will be described with reference to FIGS. 3A to
7B.

[0059] As shown in FIG. 5A, the seal body 30 is inserted into the recess
11 of the jacket body 10 to place the fan 32 in a lower side, and put the
circumferential edge 30a of the seal body 30 on the supporting surface
15a. Then, the step side surface 15b of the jacket body 10 and the outer
circumferential surface 30b of the seal body 30 are mutually confronted
to constitute a butting portion 40.

[0060] In this embodiment, a part of the butting portion between the
jacket body 10 and the seal body 30 is temporarily joined together with
use of a small rotary tool 60 (showing only a plane form in FIG. 5A) for
temporary joint as being smaller than the rotary tool 50, prior to a step
(forming the plasticized region 41) performing a formal joint by the
rotary tool 50 as shown in FIGS. 3A and 3B.

[0061] The rotary tool for temporary joint 60 is provided with a smaller
shoulder in diameter than the rotary tool 50 and the stir pin (as not
shown). The plasticized region 45 manufactured by the rotary tool for
temporary joint 60 has a smaller width than a width of the plasticized
region 41 (See FIG. 5B) manufactured by the rotary tool 50 in the
following step. The plasticized region 45 is formed at a position as not
jutted out (a position in which a center in width of the plasticized
region 45 is set as the butting portion in this embodiment) from a
position forming the plasticized region 41 in the following step. Then,
as the plasticized region 45 at the temporary joint is completely covered
with the plasticized region 41, traces drawn by the rotary tool for
temporary joint 60 stayed in the plasticized region 45 and traces of the
plasticized region 45 are not left behind.

[0062] In this embodiment, the butting portion 40 forms like substantially
a rectangle (rectangular frame) with four corners chamfered in a circle.
In a step for temporarily joining together the butting portion 40 by the
rotary tool for temporary joint 60, after previously and temporarily
joining together the opposite angles 44a, 44b chamfered at one butting
portion 40 are temporarily joined together, opposite angles 44c, 44d
chamfered at the other butting portion 40 are temporarily joined
together. By temporarily joining together in such order, the seal body 30
can be temporarily joined together to the jacket body 10 in a good
balance. Then, a positioning accuracy relative to the jacket body 10 of
the seal body 30 improves, and a deformation of the seal body 30 can be
effectively prevented. After the temporary joint performed at each
opposite angle 44a, 44b, 44c, or 44d, when the rotary tool for temporary
joint 60 is drawn, traces drawn 61 (See FIG. 5B) remains. It is left in
this embodiment.

[0063] Next, the formal joint is performed by the rotary tool 50. In this
step, as shown in FIG. 5B, after the rotary tool 50 for friction stir
welding is inserted rotating in the insert position 53, it is moved on
the butting portion 40 and moved along the butting portion 40. At this
time, it is preferable to previously apply a tool (as not shown)
surrounding the jacket body 10 from four directions on an outer
circumferential surface of the peripheral wall 14 of the jacket body 10.
In this case, even if a thickness of the peripheral wall 14 is thin and a
distance (gap) between an outer circumferential surface of the shoulder
51 of the rotary tool 50 (See FIG. 3A) and an outer circumferential
surface of the peripheral wall 14 is, for example, 2.0 mm or less, the
peripheral wall 14 is hard to deform by an indentation force of the
rotary tool 50. In case where a thickness of the peripheral wall 14 is
thick, the above tool may not be installed.

[0064] The rotary tool 50 is made of hard metallic material than the
jacket body 10 and the seal body 30. As shown in FIG. 3A, it is provided
with the shoulder 51 having a cylinder and a stir pin (probe) 52 provided
under a lower edge surface of this shoulder 51. The size and form of the
rotary tool 50 are designated according to material, thickness, or the
like of the jacket body 10 and the seal body 30. In this embodiment, the
stir pin 52 forms like a crucible former with its lower reduced diameter,
and the extension L1 is a thickness T1 or more of the lid plate portion
31 of the seal body 30. Then, at the time of friction stir welding, a tip
of the shoulder 51 of the rotary tool 50 is intruded from a surface of
the jacket body 10 and the seal body 30 in a predetermined depth and a
tip of the stir pin 52 is pierced through the supporting surface 15a. A
radius R2 of the shoulder 51 is smaller than a width H1 of the supporting
surface 15a. The rotation speed of the rotary tool 50 is 500 to 15000
(rpm), the feed speed is 0.05 to 2 (m/min), and the indentation force
pressing the butting portion 40 is approximately 1 to 20 (kN). They are
appropriately selected according to a material, plate thickness, and form
of the jacket body 10 and the seal body 30.

[0065] Hereinafter, a movement of the rotary tool 50 will be specifically
described. At first, the rotary tool 50 is inserted, rotating into the
insert position 53. The insert position 53 of the rotary tool 50 is
positioned to be an upper surface of the peripheral wall 14 strayed off
from the butting portion 40 to the outside as shown in FIG. 5B. A
prepared hole (as not shown) may be previously provided in the insert
position 53 of the rotary tool 50. In this way, the insert time
(intruding time) of the rotary tool 50 can be reduced.

[0066] The rotary tool 50 is, thereafter, moved rotating to an overhead
position (position on which an axis of the rotary tool 50 is over the
butting portion 40) of the butting portion 40 from the insert position
53. When the rotary tool 50 moves to an overhead position of the butting
portion 40, the rotary tool 50 is moved by changing its moving direction
such that a center (axis) of the rotary tool 50 moves along the butting
portion 40. In this time, the rotary tool 50 is moved, rotating in order
to place the seal body 30 in a flow side rotating the rotary tool 50 in
an opposite direction of the moving direction of the rotary tool 50 (See
an Arrow Y1 in FIGS. 5B and 6A). Specifically, a rotational direction
(self-rotation direction) of the rotary tool 50 at the butting portion 40
is arranged in a same direction as the moving direction (revolutional
direction). Namely, in this embodiment, as shown in FIG. 5B, as the
rotary tool 50 is moved to rotate in a clockwise direction relative to
the opening 12 of the recess 11 (See FIG. 5A), the rotary tool 50 is
rotated in a clockwise direction (See an Arrow Y2 in FIGS. 5B and 6A). In
addition, when the rotary tool 50 moves in a counterclockwise direction
relative to the opening 12 of the recess 11, the rotary tool 50 rotates
in a counterclockwise direction.

[0067] In this way, as the relative speed in an outer circumference of the
rotary tool 50 relative to the seal body 30 amounts to a reduced value
(seal body 30 is equal to the flow side 50a) of a magnitude of the moving
speed from a magnitude of tangential speed at an outer circumference of
the rotary tool 50, the speed becomes low compared with a shear side 50b
rotating the rotary tool 50 in a same direction as a moving direction of
the rotary tool 50. Accordingly, a cavity defect is hard to occur in the
side of the seal body 30. As the shear side 50b is located in the
thick-wall portion of the jacket body 10 positioning closer to an outside
of the butting portion 40, a metal deficiency never occurs.

[0068] As shown in FIG. 3A, the stir pin 52 of the rotary tool 50 is so
constituted that as the length L1 is longer than the thickness T1 of the
seal body 30, a tip of the stir pin 52 goes through the supporting
surface 15a and inserts deeply into the jacket body 10. Thus, a tip
(lower end) of the plasticized region 41 formed by the rotary tool 50 is
formed by deeply intruding in the deep side of the jacket body 10.
Herein, "plasticized region" contains both a plastic condition by heating
based on a friction heat of the rotary tool 50 and a condition returned
to normal temperature by passing through the rotary tool 50.

[0069] In succession, when the rotary tool 50 continues to rotate and
move, the plasticized region 41 is formed, by which the rotary tool 50
makes one round along the butting portion 40 around the opening 12. When
the rotary tool 50 has made one round, the rotary tool 50 moves by a
predetermined length along an initiating edge including one-round
initiating edge 54a (a portion ranging (from the initiating edge 54a to
the advanced position (a same position as the terminating edge 54b) as a
predetermined distance toward a moving direction of the rotary tool 50).
The initiating edge 54a and the terminating edge 54b in a circumference
direction of the rotary tool 50 are mutually overlapped. Then, a part of
the plasticized region 41 comes to overlap.

[0070] As shown in FIG. 6B, after the rotary tool 50 has terminated a
movement of first one round, the plasticized region 43 (hereinafter
referred to as "second plasticized region") is formed by one more round
of the rotary tool 50. At second one round, the rotary tool 50 shifts
outside the plasticized region 41 formed by moving at one round from a
terminating edge 54b at the first one round.

[0071] In this case, a shift of the rotary tool 50 moves oblique to shift
outside as it advances toward a moving direction and an inner side edge
of moving locus (plasticized region 43) of second one round of the rotary
tool 50 is placed on a center line (butting portion 40) of one round
moving locus (plasticized region 41) or slightly outside the center line.
Thereafter, the rotary tool 50 moves in parallel, keeping a constant
relationship with one round moving locus (plasticized region 41) as shown
in FIG. 6B. Accordingly, an outer circumference portion of the one round
moving locus is restirred by moving second one round of the rotary tool
50. (See FIGS. 6A to 7B). Then, even if cavity defect occurs in an outer
circumference of the plasticized region 41 in the shear side 50b of the
rotary tool 50, the cavity defects can be canceled by restirring.

[0072] As the shear side 50b of the rotary tool 50 at the second-round
movement is positioned in a thick-wall portion of the jacket body 10
placed closer to the outside of the butting portion, the metal deficiency
never occurs. Even if the cavity deficiency occurs, there is no problem
as it occurs at a position spaced far from the butting portion 40. The
second-round movement of the rotary tool 50 is the same as rotation
direction, rotation speed, moving direction, moving speed, and intruding
volume at one-round movement. (See arrows Y3, Y4 in FIGS. 6B and 7A). In
addition, the rotation speed, the moving speed, the intruding volume, or
the like of the rotary tool 50 at the second-round movement may be
appropriately changeable according to a form and a quality of material of
the jacket body 10 and the seal body 30.

[0073] As shown in FIG. 3B, the stir pin 52 of the rotary tool 50 is so
constituted that a tip of the stir pin 52 is deeply intruded into the
jacket body 10, as a length L1 (See FIG. 3A) is larger than a thickness
T1 (See FIG. 3A) of the seal body 30. Accordingly, a tip (lower portion)
of a second plasticized region 43 formed by the second-round movement of
the rotary tool 50 is formed to deeply intrude inside the jacket body 10.

[0074] As shown in FIG. 6A, when the rotary tool 50 terminates a
circumferential movement of the rotary tool 50, the rotary tool 50 is
designed to move toward an upper surface of the peripheral wall 14
strayed off from the plasticized region 43 to the outside and draw the
rotary tool 50 at this position (drawn position 55). In this way, as the
drawn position 55 of the rotary tool 50 is positioned to be strayed off
to the outside from the butting portion 40, the trace drawn (as not
shown) of the stir pin 52 (See FIG. 4A) is not formed in the butting
portion 40. Thus, the joint property between the joint property 10 and
the seal body 30 can improve. In addition, the trace drawn on an upper
surface of the peripheral wall 14 may be repaired by machining such as
burying welding metal in the ground.

[0075] Thereafter, the ridge 17 and the seal body 30 are joined together
by the friction stir welding with use of the above rotary tool 50. As
shown in FIG. 7B, this is designed to insert, rotating the rotary tool 50
at the insert position 56 of a tip of the ridge 17. A prepared hole (as
not shown) may be previously provided in the insert position 56 of the
rotary tool 50. In this way, the insert time of the rotary tool 50 can be
reduced.

[0076] The plasticized region 49 is formed by directing the rotary tool 50
from the insert position 56 to the outside of the butting portion 40 and
moving rotating it along the ridge 17. When the rotary tool 50 moves and
the friction stir welding is performed until an inner circumferential end
of the plasticized region 41, the rotary tool 50 is intruded in the
plasticized region 41 and moved from the plasticized region 41 to the
second plasticized region 43. Thereafter, the rotary tool 50 is moved
from an outer circumferential edge of the second plasticized region 43 to
an upper surface of the peripheral wall 14 strayed off to the outside.
Then, the rotary tool 50 is drawn away at the place (drawing position
57). In this way, as the drawing position 57 of the rotary tool 50 is
positioned to be strayed off to the outside from the butting portion 40,
the trace drawn (as not shown) of the stir pin 52 (See FIG. 4A) is not
formed in the butting portion 40. Thus, the joint property between the
jacket body 10 and the seal body 30 can be improved and enhanced. The
drawing mark placed on an upper surface of the peripheral wall 14 may be
repaired by machining such as burying welding metal in the ground.

[0077] As above mentioned, the rotary tool 50 moves linearly (See an Arrow
Y5 in FIG. 7B) along the ridge 17 from the insert position 56 to the
drawn position 57. In this time, rotating direction (self-rotation
direction), rotation speed, moving direction (revolution direction),
moving direction, and intruding volume are constant. In addition, the
rotation direction may be either counterclockwise rotation or clockwise
rotation.

[0078] As shown in FIG. 4, the stir pin 52 of the rotary tool 50 is so
constituted that as a length L1 is longer than a thickness T1 of the seal
body 30, a tip of the stir pin 52 goes through a surface 17a of the ridge
17 and intrudes deeply inside the jacket body 10 (inside the ridge 17).
Accordingly, the tip (lower end) in the plasticized region 49 made by the
rotary tool 50 is formed to be deeply intruded inside the jacket body 10.

[0079] As above described, the plasticized region 41 and the second
plasticized region 43 are formed by making two rounds the rotary tool 50
along the butting portion 40 around the opening 12 of the recess 11.
Furthermore, after the plasticized region 49 is formed by moving the
rotary tool 50 along the ridge 17 and performing the friction stir
welding and then the seal body 30 is fixed in the jacket body 10, the
liquid-cooled jacket 1 is made by removing burrs as generated in friction
stirring.

[0080] In the manufacturing method of the liquid-cooled jacket 1 in
accordance with this embodiment and the friction stir welding method, as
the friction stir welding is performed with use of the rotary tool 50
providing the stir pin 52, of which a length L1 is longer than a
thickness T1 of the seal body 30, tips of the plasticized region 41, 43,
and 46 are formed to deeply intrude in the depth of the jacket body 10.
Thus, the stress caused by heat contraction of the plasticized region 41,
43, and 46 can be dissipated in the jacket body 10. As the jacket body 10
becomes fewer in deformation on receiving the stress because of the thick
wall and fewer in stress transmitting to the seal body 30, a deformation
of the seal body 30 can be reduced.

[0081] As a width W1 of the supporting surface 15a is larger than a radius
R2 of the shoulder 51 of the rotary tool 50, the plasticized region 41
can be formed in the supporting surface 15a when the rotary tool 50 moves
to an overhead position of the butting portion 40 at one-round movement
of the rotary tool 50. In this way, as the plasticized region 41 is not
exposed in an inner surface of the recess 11, the indentation force of
the rotary tool 50 can be securely supported at the supporting surface
15a without making lower the supporting surface 15a in the side of the
bottom wall 13 of the recess 11. Accordingly, as the seal body 30 is
supported at the supporting surface 15a, the seal body 30 is not deformed
without intruding the rotary tool 50 in a lower side.

[0082] The recess 11 is provided with the ridge 17, which is the same
surface as the supporting surface 15a. The seal body 30 is supported in a
plane surface on the surface 17a of the supporting surface 15a and the
ridge 17, even in case of a large surface area in the recess 11 by
forming the plasticized region 49 along the ridge 17 and joining together
the seal body 30 in the ridge 17. In this way, a plane property of the
seal body 30 can be maintained and a deformation of the seal body 30 can
be reduced. Even if a deformation of the seal body 30 occurs at the
friction stir welding around the opening 12 of the jacket body 10, a
deformation of the seal body 30 can be reduced by joining together the
seal body 30 and the ridge 17 in the following step.

[0083] As a width W2 of the ridge 17 is larger than a diameter R1 of the
shoulder 51 of the rotary tool 50, the plasticized region 49 can be
formed in the surface 17a of the ridge 15 when the rotary tool 50 moves
to an overhead position of the ridge 17. Accordingly, as the plasticized
region 49 is not exposed in a side of the ridge 17, an indentation force
of the rotary tool 50 can be securely supported at the ridge 17 without
making lower the surface 17a of the ridge 17 in the side of the bottom
wall 13 of the recess 11. Thus, the seal body 30 is supported on the
surface 17a of the ridge 17, there is no deformation without applying an
indentation force of the rotary tool 50.

[0084] In this embodiment, as the rotary tool 50 is moved in a clockwise
direction and rotated in a clockwise direction relative to the opening
12, the thin-wall seal body 30 becomes a flow side 50a and the cavity
defect is hard to occur in a side of the seal body 30. Although the
jacket body 10 is placed in a side of the shear side 50b, as the jacket
body 10 is formed like a thick wall, the metal deficiency does not occur
even in case of the rapid relative speed in a circumference of the rotary
tool 50 relative to the jacket body 10. Thus, the cavity deficiency
caused by the metal deficiency at the butting portion can be effectively
prevented and a deterioration of the joint strength of the butting
portion 40 can be effectively prevented. Even if the cavity deficiency
occurs, it occurs at a portion spaced far from the butting portion 40 to
the outside and at a position spaced far from the channel of the heat
transport fluid. Accordingly, the heat transport fluid is hard to leak
from the channel to the outside, and it has not had a bad influence on a
sealing performance of the butting portion.

[0085] Even if the cavity deficiency occurs at first one-round movement of
the rotary tool 50 in this embodiment, the cavity deficiency can be
cancelled by restirring a portion, which positions in the shear side 50b
at the first one-round movement, at the time of second one-round movement
of the rotary tool 50.

[0086] In this embodiment, as a part of the butting portion 40 is
temporarily joined together with use of the rotary tool for temporary
joint 60 prior to a formation of the plasticized region 41 by the rotary
tool 50, it is easy to join together without moving the seal body 30 at
the time of friction stir welding by the rotary tool 50 and a positioning
accuracy relative to the jacket body 10 of the seal body 30 improves. As
the rotary tool for temporary joint 60 is smaller than the rotary tool
for formal joint 50, trace drawn of the plasticized region 45 and the
rotary tool 60 are covered by the friction stirring by moving on the
plasticized region 45 formed by the temporary joint. Then, the formal
joint has been completed.

[0087] The butting portion 40 is formed like a rectangular frame. In a
step for temporarily joining together the butting portion 40 by the
rotary tool for temporary joint 60, after one diagonal elements 44a, 44b
of the butting portion 40 are temporarily joined together, the other
diagonal elements 44c, 44d are temporarily joined together. Then, the
seal body 30 can be temporarily joined together in a good balance and a
positional accuracy relative to the jacket body 10 of the seal body 30
further improves.

[0088] In this embodiment, an initiating end 54a and a terminating end 54b
moving in a circumferential direction of the rotary tool 50 are partially
overlapped in the plasticized region 41. Then, the plasticized region 41
has no portion for disconnecting a opening circumferential edge 12a of
the recess 11. Accordingly, as the peripheral wall 14 of the jacket body
10 and the seal body 30 can be well joined together and the heat
transport fluid does not leak to the outside, a seal property in the
joint portion can improve.

Second Embodiment

[0089] Next, a manufacturing method of liquid-cooled jacket in accordance
with the second embodiment will be described with reference to FIG. 8.

[0090] As shown in FIG. 8A, this embodiment is characterized in that, in a
step for forming the plasticized regions 41, 53, and 49 with use of the
rotary tool 50 in accordance with the first embodiment, the cooling plate
70 circulating the cooling medium therethrough is provided on an opposite
surface of a surface performing the friction stir welding (a surface
opening the recess 11) of the jacket body 10, and the friction stir
welding is performed by moving the rotary tool 50 (See FIGS. 3A and 3B)
cooling down the jacket body 10.

[0091] The cooling plate 70 is configured to provide the cooling tube 72
composing of the cooling channel therein, as shown in FIG. 8B.
Specifically, the cooling plate 70 is configured by fixing to pinch the
cooling tube 72 with a pair of cooling plate bodies 71, 71. The cooling
tube 72 has a plane form formed along a moving locus of the rotary tool
50 to provide an outer circumference 72a formed along the plasticized
region 41 and the second plasticized region 43, an intermediate portion
72b formed along the plasticized region 49 of the ridge 17, an inlet
portion 72c flowing the cooling medium in, and an outlet portion 72d
flowing the cooling medium out. The cooling tube 72 is made, for example,
by a cylindrical copper tube to integrally form the outer circumference
72a, the intermediate portion 72b, the inlet portion 72c, and the outlet
portion 72d.

[0092] The cooling plate proper 71, 71 are made of aluminum or aluminum
alloy. The cooling plate proper 71, 71 are configured to form a plane
symmetrical form at an upper and lower positions each other, and form a
channel 73 for housing the cooling tube 72 in an inner side (a side of
the cooling tube 72). The channel 73 forms like a semi-circular form in
section and is designed to keep in close contact between the inner
circumferential surface of the channel 73 and the outer circumferential
surface of the cooling tube 72 by pinching the cooling tube 72 with use
of the cooling plate proper 71, 71. The channel 73 is, for example,
formed by cutting work or the like on a surface of the cooling plate
proper 71. The cooling plate proper 71, 71 are, for example, joined
together by an adhesive having good thermal conductivity. The joint
between the cooling plate proper 71, 71 is not limited to the adhesive
and may be the other method such as welding or friction stir welding.

[0093] After the jacket body 10 as the seal body 30 attached is fixed to
an upper portion of the cooling plate 70 in such a constitution, the
friction stir welding is performed by flowing the cooling medium through
the cooling tube 72.

[0094] Based on such a manufacturing method of liquid-cooled jacket, the
heat generated in the friction stir welding can be effectively absorbed
by the cooling plate 70. Thus, the thermal contraction in the plasticized
region can be effectively reduced and a deformation of warp, deflection
or the like of the seal body 30 can be effectively reduced.

[0095] In this embodiment, as the cooling channel (cooling tube 72) is
provided with, at least, a plane form along the moving locus of the
rotary tool 50, the heat generated in the friction stir welding can be
effectively and uniformly absorbed at a position near the generated
position and a deformation of the seal body 30 can be effectively
reduced. Furthermore, as the cooling channel is constituted by the
cooling tube 72 buried in the cooling plate 70, it is easy to make a
cooling channel, which is easy to flow and hard to leak. Still moreover,
as the cooling plate 70 makes the joint portion to cool down the joining
portion without providing a jet of water by a nozzle at the joint portion
in a conventional method, it is easy to manage and control the water
(cooling medium).

[0096] Although the jacket body 10 and the seal body 30 are cooled down by
flowing the cooling medium in the cooling plate 70 in this embodiment,
this is not limited thereto. For example, the friction stir welding may
be performed by flowing the cooling medium in the recess 11 sealing the
opening 12 by the seal body 30, while the jacket body 10 and the seal
body 30 are cooled down.

[0097] As the heat in the friction stir welding can be absorbed in this
way by the cooling medium without the cooling plate 70, the thermal
contraction in the plasticized regions 41, 43, and 49 can be reduced and
a deformation of the seal body 30 can be reduced, and a step for cutting
work can be simplified.

Third Embodiment

[0098] Next, a manufacturing method of the liquid-cooled jacket in
accordance with a third embodiment and a method of the friction stir
welding will be described with reference to FIGS. 9A and 9B.

[0099] As shown in FIG. 9A, this embodiment is characterized in that a
part of the butting portion 40 between the jacket body 10 and the seal
body 30 is temporarily joined together with use of a small rotary tool
for temporary joint than the rotary tool 50 prior to a step for forming
the plasticized region 41 with the rotary tool 50 relating to the first
embodiment. Temporary joint in this first embodiment is linearly
performed by the friction stir welding at an intermediate portion of each
side, although the friction stir welding is performed at a corner of the
rectangular butting portion 40 in the first embodiment. More
specifically, the butting portion 40 is formed like substantially a
rectangle (a form of rectangular frame). In a step for temporarily
joining together the butting portion 40 by the rotary tool for temporary
joint 60, after the temporary joint is performed between the intermediate
portions 46a, 46b of one opposite sides 46, 46 of the butting portion 40,
the temporary joint is performed between the intermediate portions 47a,
47b of the other opposite sides 47, 47. In this time, the plasticized
region 48 formed by the rotary tool for temporary joint 60 is,
respectively, linearly formed such that its length is the same or equal
each other. As shown in FIG. 9B, the plasticized region 48 is formed not
to stray away from a position forming the plasticized region 41 at the
following step. As a step of the formal joint forming the plasticized
regions 41, 43, and 49 by the rotary tool 50 is the same configuration as
one of the first embodiment, the explanation will be omitted.

[0100] In this embodiment, the seal body 30 can be temporarily joined
together to the jacket body 10 in good balance by performing the
temporary joint like the above order. Then, a positioning accuracy
relative to the jacket body 10 of the seal body 30 improves and a
deformation of the seal body 30 can be prevented. A gap or shift out of
place of the seal body 30 can be effectively prevented at the time of
formal joint of the rotary tool 50 by performing the temporary joint of
the seal body 30. In this embodiment, as the friction stir welding of the
temporary joint is linear, it is easy to work or machine only by linearly
moving the rotary tool for temporary joint 60.

[0101] As above described, although embodiments of this invention have
been described, the embodiment of this invention is not limited to this
and it may be appropriately changeable without departing from the gist or
essence of this invention. For example, although the seal body 30 is
substantially a rectangle as seen from top in the above embodiment, this
is not limited to this form and may be the other form such as a square, a
polygon, and a circle. The fin 32 provided in the seal body 30 may be a
separate body from a lid plate portion. For example, it may be separately
provided to house in the recess 11 and it may be integrally provided with
the jacket body.

[0102] Although the ridge 17 is provided at one portion to extend from one
wall portion 14a to the other wall portion 14b in each embodiment, this
is not limited to this and a lot of ridges may be provided. In this case,
a lot of ridges may be provided to extend from one wall portion to the
other wall portion, and the ridge may be provided with at least one every
a pair of wall portions facing each other, and a serpentine channel for
flowing or circulating cooling water may be configured.